Biogeochemistry最新文献

{"title":"Iron fertilization and soil carbon sequestration in rice paddies","authors":"Snowie Jane C. Galgo,&nbsp;Lorraine Joule B. Estrada,&nbsp;So Yeong Park,&nbsp;Ronley C. Canatoy,&nbsp;Muhammad Israr Khan,&nbsp;Benjamin L. Turner,&nbsp;Pil Joo Kim","doi":"10.1007/s10533-024-01183-7","DOIUrl":"10.1007/s10533-024-01183-7","url":null,"abstract":"<div><p>Iron (Fe) fertilization of the ocean mitigates global warming by sequestering carbon dioxide (CO₂) in phytoplankton, but the effect of Fe fertilization on carbon (C) sequestration in arable soils remains unknown. Iron is often added to rice paddies as blast furnace slag (BFS), a byproduct of steel manufacturing used as a silicon (Si) fertilizer to improve productivity. However, BFS also contains large amounts of Fe oxides, which might promote C sequestration by forming complexes with organic matter. To investigate this, we first analyzed data from a national survey of soils from South Korea to estimate the effect of continuous Fe addition via BFS on soil organic C (SOC) stocks. This revealed a strong positive correlation between SOC and extractable Fe and available Si concentrations, indicating that periodic silicate fertilizer application contributed to an increase in SOC stock. Second, to isolate the effect of Fe addition on SOC stocks, we conducted an incubation test with BFS enriched with Fe oxides (0–5%, wt wt⁻¹). Soil respiration was significantly reduced by silicate fertilizer application, and this effect was strengthened with the Fe-enriched fertilizer. Finally, to verify the effect of Fe addition on SOC stock changes in the field, we added three different Fe-enriched silicate fertilizers to rice paddies and quantified SOC stock changes by net ecosystem C budget (NECB) estimation. Silicate fertilizer significantly increased net primary production (NPP) by 18–20% over the control, and this effect was strengthened with increasing Fe addition. Silicate fertilizer application decreased soil respiration by 15–30% over the control, and this effect was strengthened further by Fe enrichment. As a result, silicate fertilizer application during rice cultivation increased the SOC stock by 0.65–0.68 Mg C ha⁻¹ over the control and by 0.90–0.96 Mg C ha⁻¹ for Fe-enriched fertilizer. In conclusion, the positive effect of BFS addition on SOC stock is related in part to the role of Fe oxides, primarily through the suppression of soil respiration. Fe-enriched silicate fertilizer therefore provides a management strategy to increase SOC stocks and crop productivity in rice paddies.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1437 - 1452"},"PeriodicalIF":3.9,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01183-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142385603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How the effect of earthworms on soil organic matter mineralization and stabilization is affected by litter quality and stage of soil development","authors":"Saliha Irshad,&nbsp;Jan Frouz","doi":"10.1007/s10533-024-01182-8","DOIUrl":"10.1007/s10533-024-01182-8","url":null,"abstract":"<div><p>Globally soil fauna consumes about half of the annual litter fall. An important question is how this activity affects the mineralization and stabilization of soil organic matter. Here we explore how much earthworms influence the decomposition of litter and the stabilization of organic matter in soils at various stages of soil development (various soil age) that are supplied with litter of various quality. The laboratory mesocosms consist of litter and a mineral layer. The mineral soils originated either from spruce and alder stands growing either on post-mining soils (young soils after about 50 years of soil development) or from soils in the close vicinity of post-mining sites (mature soils with several thousand years of soil development), the mineral soils were supplied by matching litter, the mesocosms were either without earthworms or with two individuals of earthworms. The earthworm effect showed statistically significant interaction with tree and soil age: earthworms increased respiration in both alder soils, but in spruce soils only in mature soil, while the opposite was true for young soils. In general, earthworms promoted the removal of litter from the soil surface and carbon accumulation in the mineral soil. Earthworms promoted C storage in mineral associated organic matter (MAOM), especially in young spruce soils. The results suggested that earthworm activity in young soils which were far from saturation (spruce on post-mining soils) promotes soil C sequestration by promoting C storage in MAOM, whereas earthworms in mature, C saturated soils tend to promote soil respiration. More broadly, earthworms effect on soil depends on stage of soil C saturation.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1425 - 1436"},"PeriodicalIF":3.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01182-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rainfall events stimulate episodic associative nitrogen fixation in switchgrass","authors":"Carmella Vizza,&nbsp;Matthew A. Belanger,&nbsp;Jabarius Jones,&nbsp;Sean J. Murphy,&nbsp;Daniel H. Buckley,&nbsp;G. Philip Robertson,&nbsp;Sarah S. Roley","doi":"10.1007/s10533-024-01180-w","DOIUrl":"10.1007/s10533-024-01180-w","url":null,"abstract":"<div><p>Associative N₂ fixation (ANF) is widespread but poorly characterized, limiting our ability to estimate global inputs from N₂ fixation. In some places, ANF rates are at or below detection most of the time but occasionally and unpredictably spiking to very high rates. Here we test the hypothesis that plant phenology and rainfall events stimulate ANF episodes. We measured ANF in intact soil cores in switchgrass (<i>Panicum virgatum</i> L.) in Michigan, USA. We used rain exclusion shelters to impose three rainfall treatments with each receiving 60 mm of water over a 20-day period but at different frequencies. We concurrently established a treatment that received ambient rainfall, and all four treatments were replicated four times. To assess the effects of plant phenology, we measured ANF at key phenological stages in the ambient treatment. To assess the effects of rainfall, we measured ANF immediately before and immediately after each wetting event in each treatment involving rainfall manipulation. We found that the previous day’s rainfall could explain 29% of the variation in ANF rates within the ambient treatment alone, and that bulk soil C:N ratio was also positively correlated with ANF, explaining 18% of the variation alone. Wetting events increased ANF and the magnitude of response to wetting increased with the amount of water added and decreased with the amount of inorganic N added in water. ANF episodes thus appear to be driven primarily by wetting events. Wetting events likely increase C availability, promote microbial growth, and make rhizosphere conditions conducive to ANF.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1409 - 1424"},"PeriodicalIF":3.9,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01180-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142374237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial nitrogen transformations in tundra soil depend on interactive effects of seasonality and plant functional types","authors":"Marianne Koranda,&nbsp;Anders Michelsen","doi":"10.1007/s10533-024-01176-6","DOIUrl":"10.1007/s10533-024-01176-6","url":null,"abstract":"<div><p>Nitrogen (N) cycling in organic tundra soil is characterised by pronounced seasonal dynamics and strong influence of the dominant plant functional types. Such patterns in soil N-cycling have mostly been investigated by the analysis of soil N-pools and net N mineralisation rates, which, however, yield little information on soil N-fluxes. In this study we investigated microbial gross N-transformations, as well as concentrations of plant available N-forms in soils under two dominant plant functional types in tundra heath, dwarf shrubs and mosses, in subarctic Northern Sweden. We collected organic soil under three dwarf shrub species of distinct growth form and three moss species in early and late growing season. Our results showed that moss sites were characterised by significantly higher microbial N-cycling rates and soil N-availability than shrub sites. Protein depolymerisation, the greatest soil N-flux, as well as gross nitrification rates generally did not vary significantly between early and late growing season, whereas gross N mineralisation rates and inorganic N availability markedly dropped in late summer at most sites. The magnitude of the seasonal changes in N-cycling, however, clearly differed among plant functional types, indicating interactive effects of seasonality and plant species on soil N-cycling. Our study highlights that the spatial variation and seasonal dynamics of microbial N transformations and soil N availability in tundra heath are intimately linked with the distinct influence of plant functional types on soil microbial activity and the plant species-specific patterns of nutrient uptake and carbon assimilation. This suggests potential strong impacts of future global change-induced shifts in plant community composition on soil N-cycling in tundra ecosystems.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1391 - 1408"},"PeriodicalIF":3.9,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01176-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142101621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-term warming decreased soil DOM content and microbial species in alpine wetlands but increased soil DOM content and hydrolase activity in alpine meadows on the Tibetan Plateau","authors":"Shiyu Fan,&nbsp;Jihong Qin,&nbsp;Hui Sun,&nbsp;Zhenchu Dan,&nbsp;Wenqing Chen,&nbsp;Jiyuan Yang","doi":"10.1007/s10533-024-01171-x","DOIUrl":"10.1007/s10533-024-01171-x","url":null,"abstract":"<div><p>As important carbon sinks, alpine wetlands on the Tibetan Plateau are undergoing severe degradation. To reveal warming-induced ecological shifts in alpine environments, this study determined soil nutrient contents, enzyme activities, absorption and fluorescence spectra and quadrupole time-of-flight mass spectra (metabolomes) of dissolved organic matter (DOM) and metagenomes based on short-term incubation (0 °C, 10 °C and 20 °C) of topsoil from alpine wetlands and meadows (degraded wetlands). Compared with meadows, wetlands had higher contents of soil DOM (dissolved organic carbon, dissolved organic nitrogen and dissolved phosphorous) and greater activities of hydrolases (β-glucosidase, cellobiohydrolase, β-N-acetylglucosaminidase and acid phosphatase), with those parameters all being highest at 20 °C in meadows and showing various dynamics in wetlands. Soil DOM in wetlands presented the lowest values of specific ultraviolet absorbances (SUVA₂₅₄ and SUVA₂₆₀) at 0 °C and the highest values at 10 °C, whereas the opposite was true in the meadows. Wetland soils had greater diversities of DOM molecular compositions and microbial communities, with warming gradually increasing the number of identified DOM compounds in meadows and decreasing the number of microbial species in both soils. Wetland soils had more <i>Proteobacteria</i> (44.2%) and <i>Acidobacteria</i> (21.1%) and fewer <i>Actinobacteria</i> (18.0%) than meadow soils and contained many temperature-sensitive archaea (which were abundant at 0 °C). Distance-based redundancy analysis and Procrustes analysis indicated the greater complexity of ecological responses in alpine wetlands, which may be attributed to the higher adaptive capacity of soil microbial communities. Our results suggest that both degradation and warming decrease soil DOM content and microbial activities in alpine wetlands, providing important references for alpine wetland conservation under current climate change.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1371 - 1390"},"PeriodicalIF":3.9,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01171-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142085535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Functional attributes of conifers expanding into temperate semi-arid grasslands modulate carbon and nitrogen fluxes in response to prescribed fire","authors":"Justin D. Gay,&nbsp;Bryce Currey,&nbsp;Kimberley T. Davis,&nbsp;E. N. Jack Brookshire","doi":"10.1007/s10533-024-01168-6","DOIUrl":"10.1007/s10533-024-01168-6","url":null,"abstract":"<div><p>Fire exclusion is a key factor driving conifer expansion into temperate semi-arid grasslands. However, it remains unclear how reintroducing fire affects the aboveground storage of carbon (C) and nitrogen (N) in the expanding tree species and belowground in soils. To assess the impacts of fire reintroduction C and N pools and fluxes in areas of conifer expansion we targeted a region of the Northern Great Plains that has experienced extensive woody plant expansion (WPE) of two species: ponderosa pine (<i>Pinus ponderosa)</i> and juniper (<i>Juniperus spp)</i>. We quantified tree mortality of both species to estimate the amount of dead biomass C and N produced by a recent prescribed fire, in addition to changes in soil C, pyrogenic C (PyC), and N concentrations across a woody-cover gradient using a before/after/control experimental design. Post-fire soil chemical analysis revealed a 2 year increase in mineral soil C, PyC and N, suggesting the return of fire led to the transfer of partially combusted plant organic matter back to the soil. Further, we found that functional trait differences between the two species influenced the distribution of living conifer biomass-N prior to fire. Despite junipers having 41% less total aboveground biomass than ponderosa, they contained two times more aboveground N. Prescribed fire resulted in 88% mortality of all mature juniper stems and increased fire severity correlated with greater pre-fire juniper cover. Ponderosa mortality varied by size class, with &gt; 40 cm stem diameter class having only 28% mortality. High mortality and greater aboveground N storage in juniper biomass, compared to ponderosa, led to 77% of the total conifer biomass N lost. Consequently, the functional attributes of expanding trees differentially contribute to fluxes of C and N after the return of fire, with junipers acting as conduits for N movement due to their relatively higher N content in less fire-resistant tissues and ponderosa serving as important and more stable storage pools for C. Together, these findings highlight the importance of considering species-specific traits when planning WPE management strrategies at landscape-scales, particularly when goals include C storage or soil nutrient status.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>The hypothesized effects of how carbon (C) and nitrogen (N) fluxes respond to the return of fire in grasslands experiencing conifer expansion. The question marks represent the input of fire-altered biomass from conifer trees into the soil and the transformation of living to dead tree biomass which are the focus of this study.</p></div></div></figure></div></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1335 - 1352"},"PeriodicalIF":3.9,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01168-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142042672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal patterns in riverine carbon form and export from a temperate forested watershed in Southeast Alaska","authors":"Claire Delbecq,&nbsp;Jason B. Fellman,&nbsp;J. Ryan Bellmore,&nbsp;Emily J. Whitney,&nbsp;Eran Hood,&nbsp;Kevin Fitzgerald,&nbsp;Jeffrey A. Falke","doi":"10.1007/s10533-024-01175-7","DOIUrl":"10.1007/s10533-024-01175-7","url":null,"abstract":"<div><p>Riverine export of carbon (C) is an important part of the global C cycle; however, most riverine C budgets focus on individual forms of C and fail to comprehensively measure both organic and inorganic C species in concert. To address this knowledge gap, we conducted high frequency sampling of multiple C forms, including dissolved organic C (DOC), inorganic carbon (as alkalinity), particulate organic C (POC), coarse particulate organic C (CPOC), and invertebrate biomass C across the main run-off season in a predominantly rain-fed watershed in Southeast Alaska. Streamwater concentrations were used to model daily watershed C export from May through October. Concentration and modeled yield data indicated that DOC was the primary form of riverine C export (8708 kg C/km²), except during low flow periods when alkalinity (3125 kg C/km²) was the dominant form of C export. Relative to DOC and alkalinity, export of particulate organic C (POC: 992 kg C/km²; CPOC: 313 kg C/km²) and invertebrates (40 kg C/km²) was small, but these forms of organic matter could disproportionately impact downstream food webs because of their higher quality, assessed via C to nitrogen ratios. These seasonal and flow driven changes to C form and export likely provide subsidies to downstream and nearshore ecosystems such that predicted shifts in regional hydroclimate could substantially impact C transfer and incorporation into aquatic food webs.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 11","pages":"1353 - 1369"},"PeriodicalIF":3.9,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01175-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142042671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Partitioning denitrification pathways in N2O emissions from re-flooded dry paddy soils","authors":"Yijia Tang,&nbsp;Budiman Minasny,&nbsp;Alex McBratney","doi":"10.1007/s10533-024-01164-w","DOIUrl":"10.1007/s10533-024-01164-w","url":null,"abstract":"<div><p>In flooded paddy fields, peak greenhouse gas nitrous oxide (N₂O) emission after rewetting the dry soils is widely recognised. However, the relative contribution of biotic and abiotic factors to this emission remains uncertain. In this study, we used the isotope technique (δ¹⁸O and δ¹⁵N^SP) and molecular-based microbial analysis in an anoxic incubation experiment to evaluate the contributions of bacterial, fungal, and chemical denitrification to N₂O emissions. We collected eight representative paddy soils across southern China for an incubation experiment. Results show that during the 10-day incubation period, the net N₂O emissions were mainly produced by fungal denitrification, which accounted for 58–77% in six of the eight investigated flooded paddy soils. In contrast, bacterial denitrification contributed 6–15% of the net N₂O emissions. Moreover, around 11–35% of the total N₂O emissions were derived from chemical denitrification in all soil types. Variation partitioning analysis (VPA) and principal component analysis (PCA) demonstrated that initial soil organic carbon (OC) concentrations were the primary regulator of N₂O source patterns. Soils with relatively lower OC concentration (7–15 mg g⁻¹) tend to be dominated by fungal denitrification, which accounted for the net N₂O production at the end of the incubation period. Overall, these findings highlight the dominance of the fungal denitrification pathway for N₂O production in flooded paddy soils, which predominates in soils with relatively lower OC content. This suggests that fungal contribution should be considered when optimizing agricultural management system timing to control N₂O emissions in flooded paddy soil ecosystems, and for the relevant establishment of predictive numerical models in the future.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 10","pages":"1315 - 1333"},"PeriodicalIF":3.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01164-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142022053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of mixing on seasonal carbon dioxide and methane fluxes in ponds","authors":"Joseph S. Rabaey,&nbsp;James B. Cotner","doi":"10.1007/s10533-024-01167-7","DOIUrl":"10.1007/s10533-024-01167-7","url":null,"abstract":"<div><p>Inland waters are important sources of the greenhouse gases carbon dioxide (CO₂) and methane (CH₄). Ponds have amongst the highest CO₂ and CH₄ fluxes of all aquatic ecosystems, yet seasonal variation in fluxes remain poorly characterized, creating challenges for accurately estimating annual emissions. Further, ponds can exhibit a range of mixing regimes, yet the impact of mixing regimes on gas emissions remains unclear. Here, we assessed annual dynamics of CO₂ and CH₄ in four temperate ponds (Minnesota, USA) that varied in mixing regimes. The ponds ranged from annual sinks to sources of CO₂ (−1 to 15 mol m⁻² yr⁻¹) and were all significant sources of CH₄ (4.3–8.2 mol m⁻² yr⁻¹), with annual fluxes in CO₂ equivalents of 1.8–4.1 kg CO₂-eq. m⁻² yr⁻¹. Mixing regimes impacted CO₂ and CH₄ dynamics, as stratified periods were associated with more anoxia, greater accumulation of gases in the bottom waters, higher emissions of CH₄, and lower fluxes of CO₂. Ponds with stronger summer stratification also had increased CO₂ and CH₄ fluxes associated with fall turnover. Overall, the two ponds with the strongest stratification had higher annual fluxes (2.6, 4.1 kg CO₂-eq. m⁻² yr⁻¹) compared to the two ponds that more frequently mixed (1.8, 2.2 kg CO₂-eq. m⁻² yr⁻¹).</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 10","pages":"1297 - 1314"},"PeriodicalIF":3.9,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01167-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental co-limitation on temperature responses of greenhouse gas production in floodplain sediments","authors":"Maidina Zhumabieke,&nbsp;Jinhee Huh,&nbsp;Hyunji Lee,&nbsp;Ji-Hyung Park","doi":"10.1007/s10533-024-01174-8","DOIUrl":"10.1007/s10533-024-01174-8","url":null,"abstract":"<div><p>Despite the rising interest in understanding how climate change could affect the emissions of greenhouse gases (GHGs) from river systems, including floodplains, we still lack a mechanistic understanding of how changing environmental conditions, such as moisture and nutrient availability, limit the temperature responses of GHG production in floodplain sediments. To examine the environmental co-limitations on the temperature responses of three major GHGs (CO₂, CH₄, and N₂O) produced in floodplain sediments, sediments from a constructed wetland on the floodplain of the lower Han River were incubated for 24 d at four temperatures spanning 4–28 ℃, under three conditions (closed, open/wetting, and open/drying). The net production of all three GHGs exhibited nonlinear temperature responses with gas-specific patterns and magnitudes of response varying over the incubation period. During the later incubation phase, positive temperature responses were weakened for the net production of CO₂ and CH₄ in the dried treatments, whereas a similar weakening occurred for N₂O production in the wet treatments. This, combined with incubation-induced changes in dissolved organic carbon and its fluorescence components, indicated the lack or excess of moisture and associated changes in O₂ and organic carbon availability as critical co-limiting factors for the temperature responses of GHG production. Warming decreased δ¹³C in the CH₄ emitted from wet and hypoxic sediments, implying a stronger warming effect on CH₄ production over oxidation. Unlike many studies assuming a consistent relationship between temperature and GHG production in sediments irrespective of other environmental conditions, our results suggest that warming effects on the GHG emissions from floodplain sediments would depend on the balance between gas production and consumption under the prevailing constraints of moisture, O₂, and labile carbon availability.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 10","pages":"1281 - 1295"},"PeriodicalIF":3.9,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01174-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}